Starryblue2
Lurker
This is the only app i use for Music and Video. I like that it syncs up the playlists from the built in app and vice versa, they are plenty of options to set it up just how you like but above all the BEST feature is the built in gestures (swipe up for restart, down for next, right for ff, left for rewind) it's great when driving and can't look to see where the buttons are. The Only issue I have is that if you have a large library it lags after you select a file play to play or tap to turn on shuffle (but only on the first selected file, not with every song switch) if it wasn't for that this would be perfect. But even that problem isnt annoying enough to not use this and it works with simple last.fm scrobbler.